Data from: Abbott, R.T., and M.E. Young (eds.). 1973.
American Malacologists: A national register of professional and
amateur malacologists and private shell collectors and biographies
of early American mollusk workers born between 1618 and 1900.
American Malacologists, Falls Church, Virginia. Consolidated/Drake
Press, Philadelphia. 494 pp.

Other References:

Partial Bibliography

Hemphill, H. 1891. A collector's notes on variation in shells,
with some new varieties. Zoe 1(11):321-337 + 1 plate.